Period underwear: definition and meaning
Period underwear, also called period pants, are reusable briefs with a built-in, multi-layer absorbent panel that soaks up and holds period blood while keeping the surface feeling dry. They can be worn on their own on light to moderate days or as backup with a cup, disc or tampon. Most are worn for up to 12 hours.
How they work
A typical pair has a moisture-wicking top layer, an absorbent core, and a leak-resistant barrier underneath. Absorbency is usually labeled from light to heavy or overnight. Different brands hold anywhere from the equivalent of one to several tampons.
Pros and cons
| Pros | Cons |
|---|---|
| Reusable for about 2 years or more | Higher upfront cost |
| No insertion, comfortable for beginners and teens | Need rinsing and washing after each wear |
| Good backup overnight or with a menstrual cup | May not be enough alone on very heavy days |
| No known link to toxic shock syndrome | Changing away from home means carrying a spare |
Care tips
- Rinse in cold water until it runs clear.
- Machine wash cool, without fabric softener, which blocks absorbency.
- Line dry; avoid the tumble dryer unless the label says it's fine.
- Replace when they stop holding as much, or start to smell after washing.
In 2022 a lawsuit over PFAS chemicals in one brand made headlines, so many makers now state their pants are PFAS-free. Check the label if this matters to you. Compare with other reusable period products, the menstrual disc and the tampon.
Frequently asked questions
Can period underwear handle a heavy flow?
Heavy and overnight styles can hold a lot, but if you'd soak them in a few hours, pair them with a cup or tampon. Very heavy flow is worth mentioning to a doctor.
Is period underwear good for a first period?
Yes. Many parents and teens like them because there's nothing to insert and they are less worrying at school. See our first period kit.
Do period pants smell?
Not when worn and changed as directed. Blood only develops an odor after many hours in contact with air, and the layers are designed to lock it away.
Sources
This page is for information only and isn’t medical advice. If something worries you, please talk to a doctor.
Keep reading
Reusable period products: definition and meaningReusable period products, like cups, discs, period underwear and cloth pads, are washed and used again. How each works, costs, safety and how to choose.Menstrual cup: definition and meaningA menstrual cup is a reusable silicone cup worn inside the vagina to collect period blood. How it works, how long you can wear it, and safety tips.First period kit checklist: what to pack for schoolA first period kit checklist for school bags and home: what to pack, which pads to choose, what to say to your child, and small comforts for day one.
How often should you change your pad?How often should you change your pad? Every 3 to 4 hours as a rule, sooner on heavy days. Overnight pads, signs it's time, and when it means heavy flow.What is a menstrual disc?A menstrual disc is a flat, flexible period product that sits in the vaginal fornix to collect blood. How it differs from a cup, and how to use one.